Particle counter



FIG. 1 illustrates a perspective view of the particle counter;

FIG. 2 illustrates a front view of the particle counter;

FIG. 3 illustrates a rear view of the particle counter;

FIG. 4 illustrates a right side view of the particle counter;

FIG. 5 illustrates a left side view of the particle counter;

FIG. 6 illustrates a top view of the particle counter; and,

FIG. 7 illustrates a bottom view of the particle counter. 

CLAIM The ornamental design for a particle counter, as shown. 